JPH0696365B2 - Vehicle air conditioning controller - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a vehicular air-conditioning control device, and more particularly to a vehicular air-conditioning control device having a function of processing an input signal relating to environmental conditions.

(Prior Art) Conventionally, as this type of device, for example, as shown in Japanese Patent Publication No. 62-5804, temperature control means such as a blower or a heat exchanger is controlled according to environmental information such as outside air temperature. In such an air conditioner, a detection means for detecting the amount of change or the degree of change of environmental information such as the outside air temperature per unit time is provided, and the environmental information is delayed according to the detected amount of change or the degree of change. It is known that the air-conditioning state does not fluctuate more than necessary due to changes in the environment by adjusting the time response in which the change in the adjustment amount that is input by the above-mentioned temperature change means or the change in the adjustment amount input to the above-mentioned temperature adjustment means is adjusted. ing.

(Problems to be Solved by the Invention) However, in the above-mentioned conventional example, when delay processing or the like is performed according to the degree of change of environmental information, for example, even if the degree of change in a short time is a predetermined value or more, the total change amount is However, when the number is small, it is not necessary to perform the above-described delay processing, but there is a problem in that the delay processing and the like are performed even in such a case.

Even if the amount of change is detected, it is necessary to perform signal detection for a relatively long time to determine whether the amount of change is such that delay processing or the like is performed. However, there is a problem that the load on the program becomes heavy in the case of using a microcomputer.

Therefore, the present invention aims to solve the above-mentioned problems of the conventional example and to provide an air conditioning control device for a vehicle that inputs environmental information that affects temperature control according to the change so as not to impair the air conditioning feeling. To do.

(Means for Solving the Problems) In the present invention, as shown in FIG. 1, the temperature control means 100 for controlling the temperature inside the vehicle including at least the blower and the heat exchanger, and the outside air temperature are controlled. In an air conditioning control device for a vehicle, which comprises an adjustment amount control unit 110 for setting a temperature adjustment amount of the temperature adjustment unit 100 according to detection information of an environmental condition including an outside air temperature detection unit for outputting an outside air temperature signal.
120, first judgment means 130 for judging whether or not the outside air temperature signal has converged to a signal corresponding to the true outside air temperature after the ignition switch is turned on, and the first judgment means 130.
Until the outside air temperature signal is determined to have converged to a signal corresponding to the true outside air temperature by the control, the outside air temperature signal is used as a determination reference signal that determines a determination reference in the control processing and a parameter that is used in the control processing. After the initial control means 140 for setting the operating signal and the first determining means 130 determine that the outside air temperature signal has converged to a signal corresponding to the true outside air temperature, the determination reference signal and the control A first signal processing means 150 for forming a signal by delaying the outside air temperature signal, and determining whether a difference between the outside air temperature signal and the determination reference signal is larger than a first predetermined value. The second determining means 160, the third determining means 170 for determining whether the difference between the outside air temperature signal and the determination reference signal is smaller than a second predetermined value, and the second determining means 160. The outside air temperature signal and the If the difference between the constant reference signal is determined to be greater than the first predetermined value, the second signal processing means 180 for fixing the control signal, the third
When the difference between the outside air temperature signal and the determination reference signal is determined to be smaller than the second predetermined value by the determination means 190, the determination reference signal is made to match the control signal and the control signal is used. And a third signal processing means 190 for releasing the fixation of the signal.

(Operation) Therefore, in the present invention, the first determination means 130
Until the outside air temperature signal converges to a signal corresponding to the true outside air temperature (Claim 2: the first decrease in outside air temperature is determined to have stopped, claim 3: the first decrease in outside air temperature (Until it is determined that a predetermined time that can be considered to have been stopped has elapsed), the initial control means 14
Since the determination reference signal that determines the determination reference in the control processing by 0 and the control signal used as a parameter in the control processing can be the same as the outside air temperature signal, the outside air temperature signal in the initial stage of activation of the air conditioning control It is possible to quickly follow fluctuations.

Further, after the first determining means 140 determines that the outside air temperature signal has converged to a signal corresponding to the true outside air temperature, the first signal processing means 150 causes the determination reference signal and the control signal. And are formed by delaying the outside air temperature signal, and gentle control can be executed with respect to changes in the outside air temperature.

Further, when the difference between the outside air temperature signal and the judgment reference signal becomes larger than the first predetermined value by the second judging means 160, it can be judged that the fluctuation of the outside air temperature signal is large due to the disturbance. The second signal processing means 180 fixes the control signal at this stage. As a result, it is possible to prevent the control from being disturbed due to a sudden change in the outside air temperature.

Furthermore, when the difference between the outside air temperature signal and the determination reference signal becomes smaller than the second predetermined value by the third determining means 170, it is determined that the outside air temperature signal is returning to the normal value. In order to be able to, the third signal processing means 190
By making the value of the control signal fixed by the second signal processing means 180 coincide with the judgment reference signal and releasing the fixation of the control signal, normal control can be restored. is there.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 2, the vehicle air-conditioning control device includes an air-conditioning duct 1
The intake door switching device 2 is provided on the most upstream side of the intake door switching device 2. In the intake door switching device 2, the inside air / outside air switching door 5 is arranged at a portion where the inside air inlet 3 and the outside air inlet 4 are separated. Is operated by the actuator 6 so that the air introduced into the air conditioning duct 1 can be selected between the inside air and the outside air.

The blower 7 sucks air into the air conditioning duct 1 and blows the air to the downstream side, and an evaporator 8 and a heater core 9 are provided behind the blower 7.

The evaporator 8 constitutes a cooling cycle by being pipe-connected to a compressor or the like (not shown). The heater core 9 is adapted to circulate engine cooling water (not shown) to heat the air.

An air mix door 10 is provided in front of the heater core 9. By adjusting the opening of the air mix door 10 with an actuator 11, air passing through the heater core 9 and air bypassing the heater core 9 are separated. The ratio is adjusted. Further, the downstream side of the heater core 9 is divided into a defrost outlet 12, a vent outlet 13, and a heat outlet 14 to open in the vehicle compartment, and mode doors 15a and 15b are provided at the divided portions. 15b
The blowing mode can be switched by operating the actuators 16 and 17 with.

The actuators 6, 11, 16 and 17 and the motor 7a of the blower 7 are controlled based on the output signal from the microcomputer 41 via the drive rotations 40a to 40d, respectively. The microcomputer 41 is a well-known one having a central processing unit (CPU), a read only memory (ROM), a random access memory (RAM), an input / output port (I / O), etc., which are not shown, and the microcomputer 41 Are the vehicle interior temperature T _R from the vehicle interior temperature sensor 42 that detects the temperature inside the vehicle interior, the outside air temperature T _A from the outside air temperature sensor 43 that detects the temperature of the outside air, and the solar radiation from the solar radiation sensor 44 that detects the amount of solar radiation. amount
T _S and the set temperature T _D from the temperature setter 45 that sets the temperature inside the vehicle are converted into digital signals via the multiplexer 46 and input.

An output signal is input to the microcomputer 41 from the operation unit 48. The operation unit 48 is an AUTO switch for connecting and disconnecting an automatic control state (AUTO) as a control state of the air conditioner, a changeover switch for the inside / outside air switching door (INTAKE DOOR) 5, a switch for manually setting the speed of the blower 7, etc. (Not shown).

Next, the basic control of this apparatus by the above-mentioned microcomputer 41 will be described with reference to the main flowchart shown in FIG.

First, the microcomputer 41 starts execution from step 200 and proceeds to step 202 to initialize various variables and flags.

In the next step 204, a detection signal or the like is input from the vehicle interior temperature sensor 42 or the like described above and the process proceeds to step 206. Step two
In 06, the target blowing temperature X _M of the air blown into the vehicle compartment is calculated using the detection signal input in step 204 described above, for example, according to the following equation.

X _M = A-T _D- B-T _R- C-T _AD- D-T _S + E where A, B, C, D are calculation coefficients, E is a calculation constant, and T _D
Is a set temperature, T _R is a vehicle interior temperature, T _AD is a control outside air temperature (control signal) described later, and T _S is a solar radiation amount.

Then, the process proceeds to the next step 300, and the above-mentioned target outlet temperature X
The opening degree of the air mix door 10 is calculated with respect to _M , and the air mix door 1 is set to this opening degree through the drive circuit 40b.
0 is rotated. Here, the opening degree of the air mix door 10 with respect to the target outlet temperature X _M is predetermined together with the rotation speed of the blower 7, the door positions of the mode doors 15a and 15b, and the door position of the inside / outside air switching door 5, and, for example, this The opening control is performed using a ROM version of the air mix door opening characteristics for X _M.

After that, basically, in the processes of steps 400 to 700, the drive control of each device (the blower 7, the mode doors 15a and 15b, and the inside / outside air switching door 5) is performed in the same manner as in the case of step 300 described above. In step 700, after the drive control of the compressor (not shown) is performed based on the above-mentioned target blow-out temperature, the process returns to step 204 described above and the above-described processing is repeated.

FIG. 4 shows a control routine of the outside air temperature processing which is performed as part of the above-described calculation of the target outlet temperature in step 206, and the content thereof will be described below with reference to the same figure. In addition, in this flowchart,
In order to determine that the outside air temperature signal has converged to a signal corresponding to the true outside air temperature, it is determined whether or not the first fall of the outside air temperature indicated by the outside air temperature signal has stopped.

First, the microcomputer 41 starts execution from step 208 and proceeds to step 210 to determine whether or not an ignition switch (not shown) has been switched from off to on. If it is determined that the switch has been switched from off to on (YES), go to step 212, otherwise (N
O) That is, after the ignition switch is once turned on, the process proceeds to step 228. Here, the on / off state of the ignition switch is determined because the operation of the air conditioner is linked to the on / off state of the ignition switch.

In step 212, the detected value (outside air temperature signal) T _{A of the} outside air temperature sensor 43 is input, the outside air temperature signal T _A is set in the outside air temperature variable T _{A (N−1),} and the routine proceeds to step 214. Step 214
Then set FLAG1 to FLAG3 to zero. Here, FLAG1 is called an outside air temperature sampling timer flag, and when the outside air temperature detection value is input from the outside air temperature sensor 43, it is performed at a predetermined timer time as will be described later, but this timer operates. This indicates whether or not it is in progress, and is set to "1" while the timer is operating. FLAG2 is for displaying whether or not the control outside air temperature (control signal) T _AD, which will be described later, is in a fixed state, and is set to “1” while T _AD is in a fixed state. is there. Further, FLAG3 is a judgment reference signal reset flag, which is set to "1" except that the judgment reference outside air temperature (determination reference signal) T _AB matches T _AD under a predetermined condition as described later. Is.

After step 214 described above, proceed to step 216 and T _A > T
_It is determined whether it is _{A (N-1)} . That is, in this step immediately after the apparatus is started, T _A = T _{A (N-1)} , and therefore the process proceeds to step 220. However, in the second and subsequent processes, the current outside air temperature signal T _{A is when the} previous process is executed. It has the meaning of determining whether it is larger than T _{A (N-1)} obtained by substituting the outside air temperature signal T _A of If T _A is larger than T _{A (N-1)} (YES), the process proceeds to step 218, FLAG0 is set to "1", and the step
Proceed to 224. Here, FLAG0 is for displaying whether or not the outside air temperature signal T _A is used as it is for the judgment reference signal T _AB , and the predetermined section after the ignition switch is turned on is T
_AB = T _A , and FLAG0 is set to zero.

In this way, T _AB = T _A means that, for example, when the vehicle stops after a certain amount of travel, and the ignition switch is turned on again in this stopped state, the ambient temperature sensor 43 is surrounded by the remaining heat of the engine while the vehicle is stopped. The temperature may have risen, and a value higher than the actual outside air temperature will be entered. In this state, when the control signal T _AD which will be described later is changed according to the comparison between the judgment reference outside air temperature T _AB and the outside air temperature signal T _A , a radiator fan (not shown) or the like is activated by the activation of the device. Since the engine is cooled by the operation of T.sub.A, _T.sub.AD is fixed to a value higher than the actual outside air temperature because the surrounding temperature of the outside air temperature sensor 43 is rapidly approaching the actual temperature. Therefore, the blown air temperature may be lowered more than necessary and the air volume of the blower 7 may be increased. Therefore, in order to avoid such a situation, after turning on the ignition switch, T _AB = T _A is intentionally set until a predetermined condition is satisfied.

For this reason, in step 220, as described above based on the result of the determination in step 216, it is determined that the temperature in the vicinity of the outside air temperature detector 7 that has risen due to the engine residual heat is gradually approaching the actual temperature. Impersonate and set FLAG0 to zero. Then, the routine proceeds to step 222, where the outside air temperature signal T _A is set to the outside air temperature variable T _{A (N-1)} .

In step 224, the control signal T _{AD is set} to T _A , and in step 226
Then, T _A is set to the determination reference outside air temperature T _AB, which will be described later, and the process returns to the main routine via step 278.

On the other hand, in step 228, it is determined whether or not FLAG0 is "1", and if "1" (YES), the process proceeds to step 234, "1".
If not (NO), the process proceeds to step 214 described above.

In step 232, a timer for setting a predetermined time interval for updating the determination reference signal T _AB and the control signal T _AD described later is started, FLAG1 is set to "1", and step 2
Proceed to 34. In step 234, it is determined whether or not the elapsed time t has exceeded 60 seconds since the timer was started in step 232, and if t exceeds 60 seconds (YES), the process proceeds to step 240 and it has not exceeded. In the case (NO), the process proceeds to step 236, "1" is set to FLAG1, "0" is set to both FLAG2 and FLAG3, and the process proceeds to step 238.

Then, the current T _AD value is set to the control signal T _AD , that is, T _AD
Keep on and return to the main routine via step 278.

In contrast step 240, the timer time t is willing to step 242 to set the FLAG1 to zero in response to exceeding the 60 seconds | T _A -T _AB | if a> a (YES), i.e. outside air temperature signal
If the difference between T _A and the judgment reference signal T _AB is larger than the predetermined value a (° C.), proceed to step 244. If not | T _A −T _AB |> a (NO), proceed to step 240. .

In step 244, FLAG3 is set to zero and the next step 246
Go to. In step 260, | T _A −T _AB |> b (a>
b), and if | T _A −T _AB |> b (YE
S) That is, when the difference between the outside air temperature signal T _A and the judgment reference signal T _AB is greater than or equal to a predetermined value b (° C.) (however, a> b), go to step 246, | T _A −T _AB |> b If not (NO), step
Proceed to 262 respectively.

In step 246, it is determined whether FLAG2 is "1",
If FLAG2 = 1 (YES), go to step 250, FLAG2
If is not "1" (NO), the process proceeds to step 248 and the variable N
To zero and set FLAG2 to “1” to step 2
Go to 50.

In step 250, a value obtained by adding 1 to the value of N at the present time is newly set to N, and the process proceeds to step 252.
In step 252, the value of T _AD is held at the current value and the process proceeds to step 254.

In step 254, it is judged whether T _A > T _AB , and T _A > T
_In the case of _AB (YES), proceed to step 256, where N × C is set in T _AD.
The value of (C is a unit predetermined temperature) is added and set to T _AB . If T _A > T _AB is not satisfied (NO), the flow advances to step 258 to subtract the value of N × C from T _AD and set it in T _AB . Then, after step 256 or 258 described above, the process returns to the main routine via step 278.

On the other hand, if NO at step 260 described above, the routine proceeds to step 262, where FLAG2 is set to zero and the routine proceeds to step 264. In step 264, it is determined whether or not FLAG3 is "1". When FLAG3 is "1" (YES), the process directly goes to step 268, and when FLAG3 is not "1" (NO), the variable N is set to zero in step 266. After setting FLAG3 to "1", the process proceeds to step 268.

In step 268, after N + 1 is newly set to N, the routine proceeds to step 270, where it is determined whether the outside air temperature signal T _A is larger than the control signal T _AD . In the case of T _A> T _AD (YES), the process proceeds to step 276 as the value of the new T _AD those obtained by adding the value of N × C to T _AD at the moment the program proceeds to step 272. If T _A > T _AD (NO), proceed to step 274,
The minus the N × C from T _AD at the moment as a new value of T _AD advances to step 276.

In step 276, the value of T _AD updated in step 272 or 274 is set to T _AB , and the process returns to the main routine via step 278.

Next, the operation of the present apparatus will be comprehensively described with reference to FIG.

First, FIG. 6, before the ignition switch is turned, T _AD when ambient initiates processing of the outside air temperature by the device if you are higher than the outside air temperature of the actual outside air temperature sensor 43 by the residual heat of the engine or the like FIG. 4 is an explanatory diagram of a change in the above, and when the ignition switch is turned on (NO), a relatively high value is detected from the above-mentioned preconditions.

After the ignition switch is turned on, a radiator fan (not shown) operates, so that the temperature around the outside air temperature sensor 43 gradually decreases and approaches the actual outside air temperature (Fig. 6 IG). From ON to time T ₁ ). And during this time, the steps in the above-mentioned flowchart
The processing from 210 to step 226 is performed, and the outside air temperature signal T _A is directly substituted into the control signal T _AD (step
226), the target outlet temperature is calculated using the outside air temperature signal T _A.

When it is confirmed that the outside air temperature signal T _A starts to rise again, the determination reference signal T _AB and the control signal T _AD become | T _A −T _AB |> a every 60 seconds thereafter. Up to a predetermined temperature α
It increases by (℃) (between time T ₁ and T _{2 in} Fig. 6). Here, the case where the once lowered temperature rises again as shown in FIG. 6 may be the case where the vehicle is stopped even if the ignition switch is turned on.
The above-mentioned processing is step 216, steps 218 to 226 and step 228 to step 228 in the flow chart of FIG.
It is performed by 256.

Then, after | T _A −T _AB |> a is satisfied at time T ₂ , T _AB is increased by α (° C.) every 60 seconds as before, but T _AD is | T The value at the time when _A- T _AB |> a is satisfied is fixed (see step 252 in FIG. 4). Therefore, during this period, the same value is used for T _AD in the calculation of the target outlet temperature X _M. In FIG. 6, T _A and T _AD are represented by solid lines and T _AB is represented by dotted lines.

After this, the outside air temperature signal T _A goes down, and | T _A −T _AB |
b (provided that | T _A −T _AB |> a does not hold)
If T B is satisfied (time T _{3 in} FIG. 6), then T _AB is again increased by α (° C) from the previous fixed value, and at the same time T _AB is made equal to the value of T _AD. It These processes are executed by steps 260 to 276 in the flowchart of FIG.

Here, the case where T _A drops sharply as shown in FIG.
For example, this is the case when a vehicle that has been stopped until then starts traveling.

Then, when T _A further decreases and becomes lower than T _AD , T _AD is reduced by α (° C) every 60 seconds, and | T _A −T _AD |> a holds (time T _{4 in} FIG. 6). , T _AD is fixed in the same manner as the processing at time T ₂ , while T _AB is decreased by α (° C) as it is. (See step 274 in FIG. 4).

Note that, after that, basically the same processing as the processing from time T _{2 to} T ₃ is repeated, and therefore the description thereof is omitted.

FIG. 5 shows a second embodiment of the outside air temperature processing as a flow chart, but the same processing steps as those in the above-mentioned embodiment are given the same numbers as those in FIG. 4 and their explanations are omitted. Hereinafter, only different points will be described with reference to FIG.

The second embodiment is different from the above-described embodiment in that the condition for starting the process of changing T _AD by α (° C.) is that the outside air temperature signal is true outside air in the above embodiment. It depends on whether T _A > T _{A (N-1)} holds to determine whether or not the signal has converged to a signal corresponding to temperature.
In this example, a timer is provided and T _AD is changed by α (° C.) when a predetermined timer time has elapsed.

Therefore, the timer is started in step 213, and it is determined in step 217 whether the elapsed time t from the timer start has passed 120 seconds, and t> 120.
After the second is established, T _AD and T _AB are increased by a predetermined amount as in the first embodiment.

Looking at this in FIG. 6, according to the first embodiment, the time T ₁ changes variously in accordance with the salification of the outside air temperature signal, but according to the second embodiment, it becomes 120 seconds. It will be fixed.

In addition, in the first and second embodiments, the predetermined elapsed time of step 234 is set to 60 seconds, but it is not particularly limited to this value and may be arbitrarily set to another value. .

In addition, in the second embodiment, the predetermined time of step 217 is not particularly limited to this value, and may be freely set to another value.

Furthermore, in the present embodiment, the time for periodically increasing / decreasing T _AB and T _AD is the same, but it is not necessarily the same, and for example, even if the synchronization time for increasing / decreasing T _AD is longer than T _AB. good.

(Effect of the invention) Since the present invention is configured as described above, the temperature adjustment amount also does not suddenly change due to a sudden change in the outside air temperature as the detection information, and the air conditioning feeling is not impaired. For example, when the amount of change in the detected information is a predetermined amount due to the vehicle entering and leaving the tunnel, the control signal used for temperature adjustment is fixed, so it is possible to more effectively prevent sudden changes in the air conditioning state. Stable air conditioning control can be obtained.

In addition, the outside air temperature is not used as it is for temperature control except in a specific case immediately after the ignition switch is turned on. It does not have to be an expensive one with a characteristic coating or the like for reducing the cost, and an inexpensive sensor can be used, and the cost of the device can be reduced.

Further, if the detection information is used as it is from when the ignition switch is turned on until the predetermined condition is satisfied, for example, when a temperature higher than the true outside air temperature is detected after the ignition switch is turned on and then the detected temperature falls. In addition, it is possible to prevent the control signal from being fixed to a temperature higher than the true outside air temperature due to the action of the operation control means, and it is possible to provide a more comfortable air conditioner.

[Brief description of drawings]

FIG. 1 is a functional block diagram of the vehicle air conditioning control device according to claim 1, FIG. 2 is a configuration diagram showing a concrete configuration of the vehicle air conditioning control device according to the present invention, and FIG. FIG. 4 is a main flowchart showing an example of control operation of air conditioning control in a microcomputer used in the apparatus, FIG. 4 is a flowchart showing an example of control operation of outside air temperature processing by the microcomputer, and FIG. 5 is a second flowchart of outside air temperature processing by the microcomputer. A flow chart showing an embodiment,
FIG. 6 is a characteristic diagram showing changes in the outside air temperature signal, the control signal, and the determination reference signal in the outside air temperature processing. 41 …… Microcomputer, 43 …… Outside temperature sensor,
46 …… multiplexer, 47 …… A / D converter.

Claims (3)

[Claims] 1. A temperature control means for controlling a temperature inside a vehicle compartment including at least a blower and a heat exchanger, and a temperature control amount of the temperature control means is set in accordance with detection information of environmental conditions including an outside air temperature. In a vehicular air-conditioning control device having an adjustment amount control means, an outside air temperature detecting means for outputting an outside air temperature signal and whether or not the outside air temperature signal converges to a signal corresponding to the outside air temperature after turning on an ignition switch. First to judge
For determining the outside air temperature signal until the outside air temperature signal is determined to have converged to a signal corresponding to the true outside air temperature by the first determining means and the determining means for determining the outside air temperature signal. After it is determined that the outside air temperature signal has converged to a signal corresponding to the true outside air temperature by the first determination means, the initial control means to be a signal and a control signal used as a parameter in the control processing, A first signal processing means for forming the judgment reference signal and the control signal by delaying the outside air temperature signal; and a difference between the outside air temperature signal and the judgment reference signal from a first predetermined value. Second determining means for determining whether or not it is greater, third determining means for determining whether or not the difference between the outside air temperature signal and the determination reference signal is less than a second predetermined value, and By the judgment means of 2 Second signal processing means for fixing the control signal when it is determined that the difference between the outside air temperature signal and the determination reference signal is larger than the first predetermined value; and the third determination means. When it is determined that the difference between the outside air temperature signal and the determination reference signal is smaller than the second predetermined value, the determination reference signal is made to match the control signal and the control signal is fixed. Third to release
An air conditioning system for a vehicle, comprising: 2. The outside temperature signal corresponds to the true outside temperature by determining whether or not the first decrease of the outside temperature indicated by the outside temperature signal has stopped. The vehicle air conditioning control device according to claim 1, wherein it is determined whether or not the signal has converged. 3. The first determining means determines whether or not the outside air temperature signal has converged to a signal corresponding to the true outside air temperature by determining whether or not a predetermined time set by a timer has elapsed. It is determined whether or not
The vehicle air conditioning control device described.